Secondary-electron imaging of bulk crystalline specimens in an aberration corrected STEM
In this study, we explore the practicality of scanning transmission electron microscope (STEM) imaging with secondary electrons (SE), using a silicon-wedge specimen having a maximum thickness of 18 μm. We find that the atomic structure is present in the entire thickness range of the SE images although the background intensity increases moderately with thickness. The consistent intensity of secondary electron (SE) images at atomic positions and the modest increase in background intensity observed in silicon suggest a limited contribution from SEs generated by backscattered electrons, a conclusion supported by our multislic...
Source: Ultramicroscopy - April 14, 2024 Category: Laboratory Medicine Authors: Sooyeon Hwang Lijun Wu Kim Kisslinger Judith Yang Ray Egerton Yimei Zhu Source Type: research
High-resolution scanning tunneling microscope and its adaptation for local thermopower measurements in 2D materials
We present the design, fabrication and discuss the performance of a new combined high-resolution Scanning Tunneling and Thermopower Microscope (STM/SThEM). We also describe the development of the electronic control, the user interface, the vacuum system, and arrangements to reduce acoustical noise and vibrations. We demonstrate the microscope's performance with atomic-resolution topographic images of highly oriented pyrolytic graphite (HOPG) and local thermopower measurements in the semimetal Bi2Te3. Our system offers a tool to investigate the relationship between electronic structure and thermoelectric properties at the n...
Source: Ultramicroscopy - April 13, 2024 Category: Laboratory Medicine Authors: Jose D Berm údez-Perez Edwin Herrera-Vasco Javier Casas-Salgado Hector A Castelblanco Karen Vega-Bustos Gabriel Cardenas-Chirivi Oscar L Herrera-Sandoval Hermann Suderow Paula Giraldo-Gallo Jose Augusto Galvis Source Type: research
High-resolution scanning tunneling microscope and its adaptation for local thermopower measurements in 2D materials
We present the design, fabrication and discuss the performance of a new combined high-resolution Scanning Tunneling and Thermopower Microscope (STM/SThEM). We also describe the development of the electronic control, the user interface, the vacuum system, and arrangements to reduce acoustical noise and vibrations. We demonstrate the microscope's performance with atomic-resolution topographic images of highly oriented pyrolytic graphite (HOPG) and local thermopower measurements in the semimetal Bi2Te3. Our system offers a tool to investigate the relationship between electronic structure and thermoelectric properties at the n...
Source: Ultramicroscopy - April 13, 2024 Category: Laboratory Medicine Authors: Jose D Berm údez-Perez Edwin Herrera-Vasco Javier Casas-Salgado Hector A Castelblanco Karen Vega-Bustos Gabriel Cardenas-Chirivi Oscar L Herrera-Sandoval Hermann Suderow Paula Giraldo-Gallo Jose Augusto Galvis Source Type: research
Reflection imaging with a helium zone plate microscope
Ultramicroscopy. 2024 Mar 25;261:113961. doi: 10.1016/j.ultramic.2024.113961. Online ahead of print.ABSTRACTNeutral helium atom microscopy is a novel microscopy technique which offers strictly surface-sensitive, non-destructive imaging. Several experiments have been published in recent years where images are obtained by scanning a helium beam spot across a surface and recording the variation in scattered intensity at a fixed total scattering angle θSD and fixed incident angle θi relative to the overall surface normal. These experiments used a spot obtained by collimating the beam (referred to as helium pinhole microscopy...
Source: Ultramicroscopy - April 6, 2024 Category: Laboratory Medicine Authors: Ranveig Flatab ø Sabrina D Eder Thomas Reisinger Gianangelo Bracco Peter Baltzer Bj örn Samelin Bodil Holst Source Type: research
Reflection imaging with a helium zone plate microscope
Ultramicroscopy. 2024 Mar 25;261:113961. doi: 10.1016/j.ultramic.2024.113961. Online ahead of print.ABSTRACTNeutral helium atom microscopy is a novel microscopy technique which offers strictly surface-sensitive, non-destructive imaging. Several experiments have been published in recent years where images are obtained by scanning a helium beam spot across a surface and recording the variation in scattered intensity at a fixed total scattering angle θSD and fixed incident angle θi relative to the overall surface normal. These experiments used a spot obtained by collimating the beam (referred to as helium pinhole microscopy...
Source: Ultramicroscopy - April 6, 2024 Category: Laboratory Medicine Authors: Ranveig Flatab ø Sabrina D Eder Thomas Reisinger Gianangelo Bracco Peter Baltzer Bj örn Samelin Bodil Holst Source Type: research
Reflection imaging with a helium zone plate microscope
Ultramicroscopy. 2024 Mar 25;261:113961. doi: 10.1016/j.ultramic.2024.113961. Online ahead of print.ABSTRACTNeutral helium atom microscopy is a novel microscopy technique which offers strictly surface-sensitive, non-destructive imaging. Several experiments have been published in recent years where images are obtained by scanning a helium beam spot across a surface and recording the variation in scattered intensity at a fixed total scattering angle θSD and fixed incident angle θi relative to the overall surface normal. These experiments used a spot obtained by collimating the beam (referred to as helium pinhole microscopy...
Source: Ultramicroscopy - April 6, 2024 Category: Laboratory Medicine Authors: Ranveig Flatab ø Sabrina D Eder Thomas Reisinger Gianangelo Bracco Peter Baltzer Bj örn Samelin Bodil Holst Source Type: research
Reflection imaging with a helium zone plate microscope
Ultramicroscopy. 2024 Mar 25;261:113961. doi: 10.1016/j.ultramic.2024.113961. Online ahead of print.ABSTRACTNeutral helium atom microscopy is a novel microscopy technique which offers strictly surface-sensitive, non-destructive imaging. Several experiments have been published in recent years where images are obtained by scanning a helium beam spot across a surface and recording the variation in scattered intensity at a fixed total scattering angle θSD and fixed incident angle θi relative to the overall surface normal. These experiments used a spot obtained by collimating the beam (referred to as helium pinhole microscopy...
Source: Ultramicroscopy - April 6, 2024 Category: Laboratory Medicine Authors: Ranveig Flatab ø Sabrina D Eder Thomas Reisinger Gianangelo Bracco Peter Baltzer Bj örn Samelin Bodil Holst Source Type: research
Reflection imaging with a helium zone plate microscope
Ultramicroscopy. 2024 Mar 25;261:113961. doi: 10.1016/j.ultramic.2024.113961. Online ahead of print.ABSTRACTNeutral helium atom microscopy is a novel microscopy technique which offers strictly surface-sensitive, non-destructive imaging. Several experiments have been published in recent years where images are obtained by scanning a helium beam spot across a surface and recording the variation in scattered intensity at a fixed total scattering angle θSD and fixed incident angle θi relative to the overall surface normal. These experiments used a spot obtained by collimating the beam (referred to as helium pinhole microscopy...
Source: Ultramicroscopy - April 6, 2024 Category: Laboratory Medicine Authors: Ranveig Flatab ø Sabrina D Eder Thomas Reisinger Gianangelo Bracco Peter Baltzer Bj örn Samelin Bodil Holst Source Type: research
Reflection imaging with a helium zone plate microscope
Ultramicroscopy. 2024 Mar 25;261:113961. doi: 10.1016/j.ultramic.2024.113961. Online ahead of print.ABSTRACTNeutral helium atom microscopy is a novel microscopy technique which offers strictly surface-sensitive, non-destructive imaging. Several experiments have been published in recent years where images are obtained by scanning a helium beam spot across a surface and recording the variation in scattered intensity at a fixed total scattering angle θSD and fixed incident angle θi relative to the overall surface normal. These experiments used a spot obtained by collimating the beam (referred to as helium pinhole microscopy...
Source: Ultramicroscopy - April 6, 2024 Category: Laboratory Medicine Authors: Ranveig Flatab ø Sabrina D Eder Thomas Reisinger Gianangelo Bracco Peter Baltzer Bj örn Samelin Bodil Holst Source Type: research
Adaptive under-sampling strategy for fast imaging in compressive sensing-based atomic force microscopy
Ultramicroscopy. 2024 Apr 2;261:113964. doi: 10.1016/j.ultramic.2024.113964. Online ahead of print.ABSTRACTCompressive sensing (CS) can reconstruct the rest information almost without distortion by advanced computational algorithm, which significantly simplifies the process of atomic force microscope (AFM) scanning with high imaging quality. In common CS-AFM, the partial measurements randomly come from the whole region to be measured, which easily leads to detail loss and poor image quality in regions of interest (ROIs). Consequently, important microscopic phenomena are missed probably. In this paper, we developed an adapt...
Source: Ultramicroscopy - April 5, 2024 Category: Laboratory Medicine Authors: Peng Cheng Yingzi Li Rui Lin Yifan Hu Xiaodong Gao Jianqiang Qian Wendong Sun Quan Yuan Source Type: research
Adaptive under-sampling strategy for fast imaging in compressive sensing-based atomic force microscopy
Ultramicroscopy. 2024 Apr 2;261:113964. doi: 10.1016/j.ultramic.2024.113964. Online ahead of print.ABSTRACTCompressive sensing (CS) can reconstruct the rest information almost without distortion by advanced computational algorithm, which significantly simplifies the process of atomic force microscope (AFM) scanning with high imaging quality. In common CS-AFM, the partial measurements randomly come from the whole region to be measured, which easily leads to detail loss and poor image quality in regions of interest (ROIs). Consequently, important microscopic phenomena are missed probably. In this paper, we developed an adapt...
Source: Ultramicroscopy - April 5, 2024 Category: Laboratory Medicine Authors: Peng Cheng Yingzi Li Rui Lin Yifan Hu Xiaodong Gao Jianqiang Qian Wendong Sun Quan Yuan Source Type: research
Isolated scan unit and scanning tunneling microscope for stable imaging in ultra-high magnetic fields
In this study, we present an isolated scan unit featuring non-magnetic design and ultra-high stability, as well as bidirectional movement capability. Different types of piezoelectric motors can be incorporated into the scan unit to create a highly stable STM. The standalone structure of scan unit ensures a stable atomic imaging process by decreasing noise generated by motor. The non-magnetic design makes the scan unit work stable in high magnetic field conditions. Moreover, we have successfully constructed a novel STM based on the isolated scan unit, in which two inertial piezoelectric motors act as the coarse approach act...
Source: Ultramicroscopy - March 28, 2024 Category: Laboratory Medicine Authors: Jihao Wang Zihao Li Kesen Zhao Shuai Dong Dan Wu Wenjie Meng Jing Zhang Yubin Hou Yalin Lu Qingyou Lu Source Type: research
Isolated scan unit and scanning tunneling microscope for stable imaging in ultra-high magnetic fields
In this study, we present an isolated scan unit featuring non-magnetic design and ultra-high stability, as well as bidirectional movement capability. Different types of piezoelectric motors can be incorporated into the scan unit to create a highly stable STM. The standalone structure of scan unit ensures a stable atomic imaging process by decreasing noise generated by motor. The non-magnetic design makes the scan unit work stable in high magnetic field conditions. Moreover, we have successfully constructed a novel STM based on the isolated scan unit, in which two inertial piezoelectric motors act as the coarse approach act...
Source: Ultramicroscopy - March 28, 2024 Category: Laboratory Medicine Authors: Jihao Wang Zihao Li Kesen Zhao Shuai Dong Dan Wu Wenjie Meng Jing Zhang Yubin Hou Yalin Lu Qingyou Lu Source Type: research
Isolated scan unit and scanning tunneling microscope for stable imaging in ultra-high magnetic fields
In this study, we present an isolated scan unit featuring non-magnetic design and ultra-high stability, as well as bidirectional movement capability. Different types of piezoelectric motors can be incorporated into the scan unit to create a highly stable STM. The standalone structure of scan unit ensures a stable atomic imaging process by decreasing noise generated by motor. The non-magnetic design makes the scan unit work stable in high magnetic field conditions. Moreover, we have successfully constructed a novel STM based on the isolated scan unit, in which two inertial piezoelectric motors act as the coarse approach act...
Source: Ultramicroscopy - March 28, 2024 Category: Laboratory Medicine Authors: Jihao Wang Zihao Li Kesen Zhao Shuai Dong Dan Wu Wenjie Meng Jing Zhang Yubin Hou Yalin Lu Qingyou Lu Source Type: research
Isolated scan unit and scanning tunneling microscope for stable imaging in ultra-high magnetic fields
In this study, we present an isolated scan unit featuring non-magnetic design and ultra-high stability, as well as bidirectional movement capability. Different types of piezoelectric motors can be incorporated into the scan unit to create a highly stable STM. The standalone structure of scan unit ensures a stable atomic imaging process by decreasing noise generated by motor. The non-magnetic design makes the scan unit work stable in high magnetic field conditions. Moreover, we have successfully constructed a novel STM based on the isolated scan unit, in which two inertial piezoelectric motors act as the coarse approach act...
Source: Ultramicroscopy - March 28, 2024 Category: Laboratory Medicine Authors: Jihao Wang Zihao Li Kesen Zhao Shuai Dong Dan Wu Wenjie Meng Jing Zhang Yubin Hou Yalin Lu Qingyou Lu Source Type: research
